A lot of work on the presentation

The shell auto-image now runs code and turns the output into an image
that is embedded into the document

The prompt is configurable in /bin/prompt

The first draft is done up until the references section

shell/git-init

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+rm -rf /tmp/demo/
+echo '$ mkdir /tmp/demo'
+mkdir -p /tmp/demo/
+echo '$ cd /tmp/demo'
+cd /tmp/demo/
+echo '$ git init'
+git -c colour.ui=always init